/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.catalina.tribes.group.interceptors;

import org.apache.catalina.tribes.ChannelMessage;
import org.apache.catalina.tribes.Member;
import org.apache.catalina.tribes.group.GroupChannel;
import org.apache.catalina.tribes.group.InterceptorPayload;
import org.apache.catalina.tribes.transport.bio.util.LinkObject;
import org.apache.catalina.tribes.util.ExecutorFactory;
import org.apache.catalina.tribes.util.TcclThreadFactory;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicLong;

/**
 * Same implementation as the MessageDispatchInterceptor
 * except it uses an atomic long for the currentSize calculation
 * and uses a thread pool for message sending.
 *
 * @author Filip Hanik
 * @version 1.0
 */

public class MessageDispatch15Interceptor extends MessageDispatchInterceptor {

	protected AtomicLong currentSize = new AtomicLong(0);
	protected ExecutorService executor = null;
	protected int maxThreads = 10;
	protected int maxSpareThreads = 2;
	protected long keepAliveTime = 5000;

	@Override
	public long getCurrentSize() {
		return currentSize.get();
	}

	@Override
	public long addAndGetCurrentSize(long inc) {
		return currentSize.addAndGet(inc);
	}

	@Override
	public long setAndGetCurrentSize(long value) {
		currentSize.set(value);
		return value;
	}

	@Override
	public boolean addToQueue(ChannelMessage msg, Member[] destination, InterceptorPayload payload) {
		final LinkObject obj = new LinkObject(msg, destination, payload);
		Runnable r = new Runnable() {
			@Override
			public void run() {
				sendAsyncData(obj);
			}
		};
		executor.execute(r);
		return true;
	}

	@Override
	public LinkObject removeFromQueue() {
		return null; //not used, thread pool contains its own queue.
	}

	@Override
	public void startQueue() {
		if (run) return;
		String channelName = "";
		if (getChannel() instanceof GroupChannel
				&& ((GroupChannel) getChannel()).getName() != null) {
			channelName = "[" + ((GroupChannel) getChannel()).getName() + "]";
		}
		executor = ExecutorFactory.newThreadPool(maxSpareThreads, maxThreads,
				keepAliveTime, TimeUnit.MILLISECONDS,
				new TcclThreadFactory("MessageDispatch15Interceptor.MessageDispatchThread" + channelName));
		run = true;
	}

	@Override
	public void stopQueue() {
		run = false;
		executor.shutdownNow();
		setAndGetCurrentSize(0);
	}

	public long getKeepAliveTime() {
		return keepAliveTime;
	}

	public void setKeepAliveTime(long keepAliveTime) {
		this.keepAliveTime = keepAliveTime;
	}

	public int getMaxSpareThreads() {
		return maxSpareThreads;
	}

	public void setMaxSpareThreads(int maxSpareThreads) {
		this.maxSpareThreads = maxSpareThreads;
	}

	public int getMaxThreads() {
		return maxThreads;
	}

	public void setMaxThreads(int maxThreads) {
		this.maxThreads = maxThreads;
	}

}